Looking at the news coverage, I found Sen. Clinton didn't often bring up LGBT -- and it was more often than not only when she was asked a question. And the only place trans got mentioned was the 'T' in GLBT -- she preferred to use GLBT or 'Gay and Lesbian' when she was in a situation where she had to speak to the issue (i.e., someone else brought it up. Even when answering a question about ENDA, she could not utter the word 'transgender', 'gender identity/expression' was a rarity, and the usual response was a euphemistic phrase like 'fully inclusive'. Plus, the Clintons' actions in the past have been to in some way pander to the 'phobes on LGBT issues, usually via 'triangulation' or trying to go for center-of-mass.
Sen. Obama has brought up LGBT equality without prompting in more speeches than has Sen. Clinton. For me, he has responded more directly to questions about LGBT issues more often than Sen Clinton. He has also spoken more directly about trans inclusion in civil rights. Without prompting, and at no small political risk, he chastized the African American christian community for their treatment of 'gays and lesbians' when speaking before the Ebenezer Baptist Church. His proactiveness in illuminating LGBT issues in his campaign, via statements, letters and ads focusing on those issues has caused Sen. Clinton to reactively present her positions. I doubt she would have without such prompting.
I would wish for even more from our elected representatives. It's not just that I'm transsexual and thus am one of those who will bear the brunt of vulnerability to prejudice, discrimination, bigotry and hate. But it bodes ill for our country if such treatment is condoned against any group. To me, Sen. Obama has been much more aggressive in promoting equality for all, and protection and support to those in our society who are otherwise unable to protect themselves of self-constituted 'moral' 'majorities.'