Well, let's look at the most authoritative source on the topic:
http://www.wmd.gov/report/index.html
It is true that Bush did not share certain "intelligence" with Congress. But what was not shared consists mainly of the Presidential Daily Briefings. Chapter 1 of the Silverman-Robb commission report (available at the above link) notes:
"Our study also revealed deficiencies in particular intelligence products that are used to convey intelligence information to senior policymakers. As noted above, during the course of its investigation the Commission reviewed a number of articles from the President’s Daily Brief (PDB) relating to Iraq’s WMD programs. Not surprisingly, many of the flaws in other intelligence products can also be found in the PDBs. But we found some flaws that were inherent in the format of the PDBs—a series of short “articles” often based on current intelligence reporting that are presented to the President each morning. Their brevity leaves little room for doubts or nuance—and their “headlines” designed to grab the reader’s attention leave no room at all. Also, a daily drumbeat of reports on the same topic gives an impression of confirming evidence, even when the reports all come from the same source."
In other words, had Congress been reading the PDB's, they likely would have gotten an even stronger impression that Saddam had WMD's than they did in fact get.
I want to end with another quote from that chapter:
"These are errors—serious errors. But these errors stem from poor tradecraft and poor management. The Commission found no evidence of political pressure to influence the Intelligence Community’s pre-war assessments of Iraq’s weapons programs. As we discuss in detail in the body of our report, analysts universally asserted that in no instance did political pressure cause them to skew or alter any of their analytical judgments. We conclude that it was the paucity of intelligence and poor analytical tradecraft, rather than political pressure, that produced the inaccurate pre-war intelligence assessments."