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On one point, partisans on both sides agree: Mitt Romney鈥檚 selection of Rep. Paul Ryan as his running mate has the potential to be a game-changer.

For Mr. Romney, Congressman Ryan of Wisconsin has given his presidential campaign energy and focus. The 鈥淩yan plan,鈥� the House Budget chairman鈥檚 proposed tax cuts, spending cuts, and dramatic rethink of entitlements, is now at the center of debate.

The immediate reaction of conservatives, who were skeptical of the former governor of Massachusetts, was excitement, and a feeling they could begin to trust Romney.

Democrats are equally thrilled about the choice of Ryan, in part for the same reason. His detailed plan, they say, gives them a club with which to beat the Romney-Ryan ticket about the head, and scare voters 鈥� especially seniors in key swing states like Florida and Ohio.

Never mind that Ryan鈥檚 proposals for Medicare and Social Security would not affect those at or near retirement. As Romney arrived in Florida Monday morning to campaign, the Obama campaign released a web video featuring older Floridians expressing alarm over cuts to Medicare under the 鈥淩omney-Ryan plan.鈥� 聽

Both sides could be right: Ryan could be a game-changer in a race that, pre-Ryan, showed President Obama with a slight edge in polls. The question is, for which side? Does it turn the tide toward Romney, or shift it more fully toward Mr. Obama?

The outcome, analysts say, could depend on which side is able to define Ryan and his plan 鈥� neither the man nor the proposal is well-known by most Americans 鈥� in the next few weeks.

The selection of Ryan is 鈥渂oth an opportunity and a danger for the Romney campaign, and an opportunity for the Obama campaign,鈥� says Cal Jillson, a political scientist at Southern Methodist University in Dallas. The president starts out ahead, he says, and therefore 鈥渢he danger for him is certainly there, but less immediate and overt.鈥�

If the 2012 race turns into a 鈥渂ase election鈥� 鈥� that is, with an electorate that consists mostly of loyal and 鈥渓eaning鈥� Democrats and Republicans, but not a lot of people who are newly inspired to vote, as in 2008 鈥� then the addition of Ryan has the potential to tip the balance for Romney.

鈥淎 base strategy might work this year because a motivated GOP base, despite its weaknesses with minority voters, might be able to outnumber the Democratic base in this election, much like it did in 2004,鈥� when President George W. Bush beat Sen. John Kerry, write Larry Sabato, Kyle Kondik, and Geoffrey Skelley of the University of Virginia Center for Politics. 鈥淚t does not appear that Romney has his base fully behind him.鈥�

That, at least, was true before the Ryan selection. And it鈥檚 still too soon to gauge Ryan鈥檚 impact on the race. But already, Romney is engaging in some fine-tuning of his approach to his running mate that could risk alienating some conservatives and reignite charges of flip-flopping.

On Saturday, the day of Ryan鈥檚 rollout, Romney campaign spokeswoman Sarah Pompei told Politico that the candidate 鈥渁pplauds鈥� Ryan鈥檚 ideas but that Romney would issue his own budget blueprint. In their joint campaign appearances on Sunday, Romney referred only to 鈥渕y plan,鈥� and did not explicitly embrace the Ryan plan.

In their joint interview Sunday on CBS鈥檚 鈥�60 Minutes,鈥� when asked if Ryan could teach him some things about the budget, Romney made clear that, if elected, they would work together. But as if to reinforce that he is the alpha dog, Romney added: 鈥淥bviously, I have to make the final call in important decisions.鈥�

At the Romney-Ryan campaign event on Saturday in Manassas, Va. 鈥� one of the most important tossup states 鈥� the crowd was eager to see Romney鈥檚 young new running mate in action. Some interviewed knew who he was, and others didn鈥檛, reflecting the fact that Ryan's national image was still very much a work in progress.

By Monday, a new poll from ABC News showed Ryan鈥檚 image improving. In weekend interviews, 38 percent of Americans responded聽favorably to Ryan鈥檚 selection for the ticket, up from 23 percent in pre-selection interviews, ABC reported. Thirty-three percent, disproportionately Democrats, see him unfavorably, and 30 percent are undecided.

At the Manassas event, some voters seemed prepared to fall in love with Ryan, even if he wasn鈥檛 their first choice for the ticket.

鈥淚f it can鈥檛 be Allen West, then Paul Ryan is the second best,鈥� says Carole Sarkuti, a local tea party activist. Congressman West, a freshman from Florida, is one of only two African American Republicans in Congress, former military, and an outspoken tea partyer.

Another attendee raised the name of another Floridian, this one frequently mentioned as a top possibility for the GOP ticket before Ryan鈥檚 selection.

鈥淚 think Marco Rubio would have brought Romney more votes,鈥� says Tom Sprain, a retired federal government employee from Manassas, referring to the junior senator from Florida. 鈥淗e would have helped with Hispanic voters and in Florida and Arizona.鈥�

But, Mr. Sprain adds, 鈥淩yan is a wonderful guy.鈥�