Article Photos: Barack Obama 3/21

<p>FILE - In this Oct. 28, 2008 file photo, then-presidential candidate Sen. Barack Obama, D-Ill., addresses supporters in rain at a rally in Chester, Pa. Democrats are closely watching the forecasts as a rainy week unfolds ahead of Obama's speech accepting his party's nomination. With Obama set to address supporters in Charlotte's open-air football stadium on Thursday, Sept. 6, 2012 party officials insist the speech will go on even if it rains. After all, they said the stadium's main tenant, the Carolina Panthers NFL team, plays no matter the weather. (AP Photo/Jae C. Hong, File)</p>