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Teachers union aiding Hillary in PA

From NBC's Mark Murray
Earlier today, we noted that Obama -- as of last week -- is outspending Clinton 5-to-1 in TV advertising in upcoming primary states.

But pro-Clinton outside groups like the American Federation of Teachers are trying to close gap. The AFT is up with a new 60-second radio ad in Pennsylvania, which began airing yesterday, that features testimonials from Keystone State voters.

"Hillary can take on John McCain," says one.

"Hillary has the solutions to solve very complex problems," says another.

"When she gets knocked down, she gets up..."

"We need a fighter in the Oval Office."

The size of the buy is $325,000, bringing AFT's total spending on behalf of Clinton to $2 million.