WAUKESHA, Wis.-- The largest crowd of the campaign so far for a Mitt Romney event welcomed home favorite son Rep. Paul Ryan at a massive rally here in the congressman's district Sunday night, pushing the GOP's vice presidential nominee to tears as he took the stage, setting off cheers with two simple words: "Hi mom." With that, voice cracking, Ryan showed his Wisconsin credentials to a crowd the Romney campaign hopes will be emblematic of the charismatic congressman's support in the Badger state, a reliably Democratic enclave the Republican candidate hopes to turn red this fall. "My veins run with...