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republican presidential hopeful rick santorum is looking to build on momentum from a string of stunning victories last night. the former pennsylvania senator won missouri's nonbinding primary as well as the gop minnesota caucuses. he was also the apparent winner of the colorado caucuses which mitt romney won four years ago and was expected to take without much effort this year. nbc's brian mohr joins us from washington with the details. brian, good morning. >> reporter: good morning, lynn. santorum had been hoping for a good night. he got a lot better. gop presidential hopeful rick s...

this is "first look" on msnbc. we begin this morning with a credible threat days before we mark the tenth anniversary of the 9/11 terror attacks, there's been a credible terror threat. tracie potts has more from ground zero. >> this information developed over the last 24 hours. authorities say it's not confirmed and at this hour, they have not yet decided to activate the new threat warning system. homeland security says there's a specific credible threat, but it's not confirmed. authorities say it appears to have involved car or truck bombs in new york. but there are conflicts about ...

about the economy. as the president prepares to make the final stop on his economic bus tour today, his republican rivals are on the road and on the attack over the nation's economic slump. nbc's steve handelsman has our report. >> reporter: on his campaign style swing through the midwest president obama was in iowa, the state that put him on the path to the white house in 2008. the path rick perry hopes he's on for 2012. the texas governor was in iowa targeting barack obama. >> mr. president, you have tried now for 2 1/2 years of government creating jobs. >> reporter: here he brags ...

we begin this morning with pat-down pressure. the transportation security administration is speaking out amid growing concerns over the new screening procedures in airports. comments from the head of the tsa point to a possible easing of new policies, but will that mean changes for fed-up passengers any time soon? nbc's tracie potts joins us from washington with the latest. tracie, good morning. >> reporter: lynn good morning. expect an aggressive, invasive and perhaps embarrassing pat-down if you refuse to go through the full body scanners, but now the tsa says that procedure may no...

we begin this morning with back to work. lawmakers will tack al long list of to-dos during a lame duck session of congress that gets under way on capitol hill today. expectations are low that we'll see much post-election progress. nbc's tracie potts joins us from washington with all the details. tracie, good morning. >> lynn, good morning. the old congress is coming back. the new congress is coming in. dozens of new members of the house of representatives and new senators hoping to make a difference. they're already filing into washington. fresh-faced members of congress armed with p...