pawlenty 's announcement coincides with the release of a new radio ad and web video where he and his wife discuss their faith .
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two republicans , minnesota rep. michele bachmann and former pennsylvania sen. rick santorum , have signed it .
the former minnesota governor is the second major candidate to decline the pledge , following former massachusetts gov.
pawlenty said wednesday he agrees with the principles behind the family leader 's marriage vow .
but he says he prefers " to choose my own words , especially seeking to show compassion to those who are in broken families through no fault of their own . "
 
 
republican tim pawlenty says he wo n't sign a pledge written by a conservative iowa group that asks presidential candidates to denounce same - sex marriage rights , pornography and forms of islamic law .