Judging from his history, I agree with you. In 2000, he ran on a platform of "comprehensive immigration reform," replete with a guest-worker program. When he got elected, he was all chuchily-muchily with Vincenze Fox and was set to push for this program, but then 9/11 happened and he had to explain to Vincenze Fox that it would be necessary to go slow on this stuff. Then in 2006, he tried to get it through but was defeated by the Republican-controlled House. After the election, he said that one good thing about the Democrats getting control of the House was that "comprehensive immigration reform" stood a better chance of getting through.
So he was always for it - but had to postpone it for a while.
bingo....