Arizona Democratic Congresswoman Gabrielle Giffords, who was shot today, is a member of the House LGBT Equality Caucus.
Steve Rothhaus at The Miami Herald reports that Giffords said the following after first being elected to Congress in 2006:

“I have stood up for equality in Arizona, and I am grateful that HRC and the GLBT community stood with our campaign during the primary and the general elections. We can accomplish so much for our families when we work together. Fairness is an essential American value, and when we champion fairness, we can win decisive victories in even the most competitive congressional districts.”

Giffords received a score of 81 out of 100 on the Human Rights Campaign’s 2008 Congressional Scorecard.
After the Senate passed a standalone bill to repeal “don’t ask, don’t tell” last month Giffords sent out this Tweet along with the photo above:

Giffords would later attend the presidential signing ceremony for DADT repeal.
HRC just released this statement from President Joe Solmonese:

“We are shocked and saddened by the events involving Congresswoman Giffords and our hearts go out to her and the other victims of this awful tragedy. Gabby Giffords is a champion for LGBT equality and a principled leader for Arizona. We wish her a speedy recovery as our thoughts and prayers are with her family as well as with the families of all of those touched by today’s horrific violence.”