"You ready to take down a giant?" - Neal
"Grab your slingshot." - Peter
Neal and Peter have faced a lot of villains over the last four seasons -- many of whom weren't afraid to kill to get what they wanted. But they've never faced a U.S. senator before. Someone like that has incredible pull. For starters, he can fire whoever gets in his way.
That worries Elizabeth and her fear for her husband's safety threatens to tear Neal and Peter apart.