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It鈥檚 increasingly looking like Rahm Emanuel鈥檚 entry into the Chicago mayor鈥檚 race is a sure thing.

The White House chief of staff is expected to announce his candidacy this week, according to . He's already been busy conducting polls and calling and meeting with just about every possible opponent.

But, can he win?

While the speculation has mostly focused on Mr. Emanuel the candidate 鈥� and what his departure would mean for the West Wing 鈥� there鈥檚 no guarantee that Chicago will actually have a Mayor Emanuel.

The biggest factor in a city that is roughly one-third white, one-third black, and one-third Hispanic is the racial politics.

Already, both the African-American and Hispanic communities have been fairly vocal about their opposition to Emanuel, in part because the default position in Chicago politics has tended to be each racial group or ethnicity supporting a candidate of its own. The question is whether they鈥檒l be able to unify behind an alternative candidate 鈥� something that seems unlikely right now.

According to , the city鈥檚 black community has been meeting regularly to try to get behind a 鈥渃onsensus鈥� candidate. Options, now that Rep. Jesse Jackson Jr. (D) is out of the running due to scandal, include former Sen. Carol Moseley Braun, Rep. Danny Davis (D), state Sens. James Meeks (D) and Rickey Hendon (D), and several others.

Senator Meeks, who is also a pastor, is popular among other black clergy. But he is a risky choice given his conservative social positions, which may not play well with the broader Chicago electorate.

Most of the candidates say they won鈥檛 run if they鈥檙e not the consensus choice, but settling on a candidate has been rough going, and some of the participants may be .

Meanwhile, Emanuel is hiring Chicago Transit Authority board chairman Terry Peterson 鈥� who ran Mayor Richard M. Daley鈥檚 campaign years ago 鈥� as his campaign manager, in an apparent effort to help his candidacy among African-Americans.

Emanuel鈥檚 tough opponents won鈥檛 just be from the black community. Hispanics may rally behind Rep. Luis Gutierrez (D) or City Clerk Miguel del Valle. And at least 10 white candidates are considering running, including Cook County Sheriff Tom Dart.

The field of possible candidates should get smaller as the Nov. 22 filing deadline nears, but everyone expects it to be a crowded race. A lack of consensus behind minority candidates could help Emanuel, who has a lot of support from the Chicago business community, in February鈥檚 election. But to win, the next mayor is going to have to capture a majority of the votes, almost certainly in a runoff election that would be held between the top two vote-getters in April.