Twitter is abuzz with the rumor and three separate Facebook groups have been set up, with the largest boasting about 2,000 members.
Mellencamp is no stranger to politics. In 2008, he recorded a radio commercial supporting Barack Obama's presidential campaign and requested that Republican candidate John McCain stop playing his songs, including "Our Country" and "Pink Houses," at his rallies.
Mellencamp's songs often have political or social themes. He is a co-founder of Farm Aid.
On Thursday, Mellencamp spokesman Bob Merlis said the musician "has no statement to offer."
