By Larry Kane

IRWIN, Pa. (CBS) — Mitt Romney returns to Pennsylvania, and a new Palin controversy has erupted.

First, the Palin story.

The Romney campaign will not comment on a Newsweek report that Sarah Palin will not be invited to speak at the GOP convention in Tampa.

Palin rented space close to the arena, and has sent e-mails to friends.  She’s not happy, and this could be problematic for Romney with the Tea Party.

At last report, Romney, who is campaigning today in Allegheny County, Pa., was still refusing to release years of tax returns as the Democrats continue their attack on his work at Bain Capital.

And in one of the most fascinating challenges yet for the Obama campaign, the National Urban League has released a survey showing that the president can’t win Ohio, North Carolina, or Virginia unless he gets at least 60 percent of the minority vote.

Meanwhile, there is buzz — not confirmed — that Romney will name his VP pick soon, to get Bain Capital and the tax return controversy out of the headlines.

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