I'm so glad you got us here. Yes, in the year or so leading up to invasion, many Congresspeople seemed to think Saddam had an active WMD program because they didn't have all the pertinent information due to the omission/cover-up of evidence by the W Bush Administration. That has been my point from the beginning. If these people voiced opinions based on lies, how does that support your point (if you even have one)?
https://www.politico.com/magazine/story/2016/01/iraq-war-wmds-donald-rumsfeld-new-report-213530
Once they found out they were lied to, most all of those who initially supported the invasion came out in strong opposition to the war and regretted their vote (and, most likely, some of those quotes)...
https://en.wikipedia.org/wiki/List_of_Congressional_opponents_of_the_Iraq_War
Further I ran down the Pelosi quote because I remembered she was one of the 23 Senators and 133 House Members that voted against the resolution authorizing invasion. The beginning of her speech that you cited ends, quote, "These costs to the war on terrorism, the loss of life, the cost to our economy, the cost in dollars to or budget, these costs must be answered for. If we go in, certainly we can show our power to Saddam Hussein. If we resolve this issue diplomatically, we can show our strength as a great country, as a great country.
Let us show our greatness. Vote no on this resolution."
The Graham truncated quote is also misleading. You noted, "We are in possession of what I think to be compelling evidence that Saddam Hussein has and has had for a number of years a developing capacity for the production and storage of weapons of mass destruction." But you left out the rest... "At what point we do what President Kennedy did in 1962, which is to make that information available to the American people and to the international community as a predicate for whatever use of force will follow, is going to be an important strategic decision for this administration." He subsequently also voted 'NO' on the invasion resolution.
Both the Pelosi and Graham quotes are cherry-picked excerpts out of context. It reflects the same dishonesty and deception that the W Bush administration exhibited that led to an unnecessary, costly and bloody mess. How ironic.