Scorching temperatures near the triple digits weren't driving away the 325 people gathered to hear Scott Walker speak at a Lexington, S.C., barbecue joint Wednesday. Packed under an open-air porch with fans that were hardly helping, the heat didn't seem to affect the enthusiasm for the Wisconsin governor on just his second day as an announced presidential candidate - and it's the type of excitement he'll need to generate to win the important South Carolina GOP primary.