Instapundit is a conservative[4] blog maintained by Glenn Reynolds, a law professor at the University of Tennessee.

[5][6] After the September 11 attacks, the site quickly became a highly popular blog—with Reynolds celebrated as "chief among the warbloggers"[7]—and was dubbed the "Grand Central Station of Bloggerville"[8] in 2002 and reported to be "the most visited [blog] in the world"[9] in early 2004.

Reynolds has also lent his support to the Porkbusters campaign, which purports to expose misallocation of federal funds.

[12] In June 2009, Reynolds changed his blog header to the color green from its original red, in support of the anti-Ahmadinejad/pro-Mousavi protests made after the Iranian Presidential election.

On September 7, 2009, Reynolds replaced the green with his customary red, remarking, "I’m back to the original design.