"I guess so" means he's not sure, not that he supports the war. Compare that to Hillary's support of the war. I made the key part large enough so that even the most blind wing-nut can see it
Clinton has been trying to weasel her way out of responsibility for helping to start that war first by falsely claiming she had been tricked by Bush, but Bush had made all of the intel he had available to all members or Congress and no one from Clinton's office had ever accessed, and now by claiming Trump also supported the war when he clearly was undecided at this date and opposed to it later.
Of course from Trump's whole answer he makes it clear it is whether the invasion would be "done correctly" is what he was not sure of! But the dishonest Right leave that part out as they lie for Trump.
And the video you posted is a perfect example of how the worthless lying scum Right try to deceive Americans. Like your incomplete Trump quote, the video stops at the most important part which clearly gives the full context. I made the key part large enough so that even the most blind wing-nut can see it!
Hillary's vote speech in context:
This matter cannot be left hanging forever with consequences we would all live to regret.
War can yet be avoided, but our responsibility to global security and to the integrity of United Nations resolutions protecting it cannot.
I urge the President to spare no effort to secure a clear, unambiguous demand by the United Nations for unlimited inspections.
And finally, on another personal note, I come to this decision from the perspective of a Senator from New York who has seen all too closely the consequences of last year's terrible attacks on our nation. In balancing the risks of action versus inaction, I think New Yorkers who have gone through the fires of hell may be more attuned to the risk of not acting. I know that I am.
So it is with conviction that I support this resolution as being in the best interests of our nation.
A vote for it is not a vote to rush to war; it is a vote that puts awesome responsibility in the hands of our President and we say to him - use these powers wisely and as a last resort. And it is a vote that says clearly to Saddam Hussein - this is your last chance - disarm or be disarmed.
Thank you, Mr. President.