His endorsements hinge on several factors — a person’s level of independence and record on immigration and guns.
Mr. Bloomberg has endorsed a Democrat, John Hickenlooper, for governor of Colorado, whose rival, Dan Maes, has called for the deportation of illegal immigrants and decried a bicycle-sharing program as a threat to personal freedom. The mayor supports Senator Michael F. Bennet, another Colorado Democrat, who is running against the Tea Party-backed Republican Ken Buck.
The mayor has endorsed Mark S. Kirk, an Illinois Republican running for the Senate who beat back a Tea Party primary candidate, and he is supporting Joe Sestak, a Pennsylvania Democrat, for the Senate. Mr. Sestak faces an uphill fight against Pat Toomey, a Tea Party challenger. In Nevada, Mr. Bloomberg has embraced Mr. Reid, whose challenger, Ms. Angle, wants to phase out Social Security.
Those seeking Mr. Bloomberg’s endorsement say that voters are not simply angry; they want solutions to problems, and that the mayor represents a government that, by all accounts, works well. Gov. Martin O’Malley of Maryland, a Democrat who won the mayor’s backing for re-election this year, said voters were “sick of partisanship and they want us to deliver.”
“Mayor Bloomberg speaks to that desire in a powerful way,” he said.
Mike Murphy, a Republican political strategist who is advising Ms. Whitman’s campaign, called Mr. Bloomberg “a very special breed.”
“People see him not through a Democratic or Republican prism, but through a results, grown-up, get-it-fixed, make-it-work prism, which is very attractive,” Mr. Murphy said. “He has a very wide appeal.”