BY MICHAEL J. MISHAK
MIAMI -- Stung by conservative backlash earlier this year, Marco Rubio has spent months seemingly trying to convince skeptical fellow Republicans that he's more than just the Florida senator who championed comprehensive immigration reform.
He joined the drive to defund President Barack Obama's health care law, though his voice grew softer as the resulting government shutdown and his party sank in polls. He then turned to championing social issues like legislative prayer.
On Saturday, Rubio will deliver the keynote address at a fundraiser for the Florida Family Policy Council, an evangelical group that led the successful 2008 effort to ban gay marriage in the state.