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Senator Roberts, you鈥檙e not in Kansas anymore.

At least that鈥檚 the way it may seem to Republican Pat Roberts, the incumbent seeking his fourth term in the US Senate.

Polls show him behind, even though Kansas is a conservative state and there鈥檚 no Democrat running against him. Part of the reason that Roberts is struggling against an independent opponent is that many voters think he spends too much time in Washington, and not in the state.

And the race, although it will be decided by Kansans, isn鈥檛 just about Kansas. It鈥檚 shaping up as one of the tossup races that could decide which party controls the Senate and 鈥� perhaps more important 鈥� as a symbolic referendum on whether the nation鈥檚 political system is broken and in need of major reform, as challenger Greg Orman asserts.

The latest news comes from the Kansas Supreme Court, which ruled Thursday that the name of Chad Taylor, the Democrat who dropped out of the race, shouldn鈥檛 appear on the November ballot.

The ruling pleases Democrats, because a simpler ballot should improve the chances of Mr. Orman knocking off his incumbent foe. Orman hasn鈥檛 said which party he鈥檒l caucus with, if elected, but has pledged that first and foremost he鈥檒l work across the aisle in Congress with the interests of Kansans at heart.

Recent opinion polls, when averaged together by the website RealClearPolitics, show Orman with a lead of 1.2 percentage points over Roberts.

Roberts is a solidly conservative former Marine who鈥檚 arguing that 鈥渃onservative Kansas values are the best medicine for what ails Washington.鈥� He touts top-tier ratings from groups including National Right to Life, the National Rifle Association, and Heritage Action. As of July, his campaign has been able to outspend Orman鈥檚 by $10 to $1.

Orman is a young business leader (and former McKinsey consultant) who argues Washington needs medicine that isn鈥檛 purely conservative or purely liberal. Growing disillusionment with the increasingly partisan behavior of Democrats and Republicans led him to become an independent and to found a Common Sense Coalition to revive centrist sensibilities.

The challenge for Roberts is that Orman can appeal to Kansans as suitably conservative on fiscal matters while appealing to social-issue voters who want someone to the left of Roberts on abortion or background checks for buying guns. A picture on Orman鈥檚 campaign website shows him shaking hands with Ronald Reagan as a teenager, as part of the Boys鈥� Nation program of the American Legion.

More broadly, though, Orman鈥檚 whole message is about what he calls 鈥渇ixing a broken system鈥� in Washington. He supports things like amending the Constitution to impose term limits on members of Congress, barring lawmakers from becoming lobbyists when they retire, and overturning a US Supreme Court ruling (Citizens United) 鈥済iving corporations the same rights as people鈥� to finance political ads.

Polls show that a majority of Americans see the political system as needing reform 鈥� and that they want members of the two parties to compromise more often to get things done. Approval of Congress stands near record lows.

A majority of Kansans, moreover, think Roberts spends too much time in Washington, according to a recent Public Policy Polling survey.

At the same time, though, it remains to be seen if the specific prescriptions Orman is backing can carry the day with voters.

Liberal donors have some incentive to promote Orman as a populist torchbearer. Democrats in the Senate recently tried without success to launch an amendment like Orman鈥檚, to overturn Citizens United.

In some scenarios, an Orman win could decide which party controls the Senate.

But the big Democratic money has to be spread among more than a handful of key competitive races 鈥� and those other races involve actual Democrats. So it鈥檚 not yet clear how much money will flow to Orman鈥檚 aid.

Faced with the surprise competition from Orman, Roberts is seeking to rally his base and revive his momentum. Former presidential candidate and senator Bob Dole is among the Kansans voicing support for the incumbent.

Political-action committees are also coming to Roberts鈥檚 aid 鈥� including 鈥渓eadership PACs鈥� from his party and gun-rights groups. Big contributors to his own campaign committee range from energy companies and agribusiness to financial services firms (Roberts sits on the Senate Finance Committee) and pharmaceutical companies.