Push for drilling taps benefits for McCain

Mr. Obama continued to lead in Michigan, Minnesota and Wisconsin, but his margin of victory slipped in all three states. In Minnesota, Mr. Obama’s edge over Mr. McCain dropped from 54 percent to 37 percent last month to 46 percent to 44 percent in the latest poll.

In Michigan, Mr. Obama topped Mr. McCain by 46 percent to 42 percent, compared with 48 percent to 42 percent last month. In Wisconsin, Mr. Obama stumbled slightly, leading 50 percent to 39 percent compared with 52 percent to 39 percent last month.

“Senator Barack Obama’s post-primary bubble hasn’t burst, but it is leaking a bit,” Mr. Brown said.

A Pew Hispanic Center poll showed Mr. Obama winning 66 percent to Mr. McCain’s 23 percent among Hispanics registered to vote.

Mr. Bush won 40 percent of the Hispanic vote in 2004, and Mr. McCain has made Hispanic outreach a hallmark of his congressional career and of his presidential campaign. The poll found that Mr. McCain is paying the cost of the Republican Party’s loss of Hispanic voters overall.

The poll also found Mr. Obama’s race is a net positive among Hispanic voters.

A Fox News/Opinion Dynamics poll found Mr. Obama leading Mr. McCain 40 percent to 37 percent nationwide, but that the Democrat’s lead increased to 48 percent to 39 percent if Mr. Obama selects Sen. Hillary Rodham Clinton of New York as his running mate and Mr. McCain chooses former Massachusetts Gov. Mitt Romney as his.

That suggests a significant number of Mrs. Clinton’s supporters are awaiting Mr. Obama’s decision on a vice-presidential nominee.

cSean Lengell, reporting in Washington, contributed to this article.

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