Former Secretary of State (and former Democratic Senator) Hillary Clinton announced her support for marriage equality yesterday. She did that just three days after Republican Senator Rob Portman announced his support for it.
Today, the Democratic Senatorial Campaign Committee is sending out the mailer above, a clear sign that Democrats see political gain to be had, right away, in Clinton's statement. If anyone sees similar mailers from the Republican Party about Portman's statement, please let us know.
See also: Steve's chart about the trendline for supporting marriage equality.