Bush's top political aide has built his career on diverting and deceiving; he'd do the same under oath.
(snip)
Rampton was a controversial figure in Texas, and Democrats suspected that he'd been consorting with Rove for years. During the 1986 gubernatorial race, when a listening device was discovered in Rove's office, it was Rampton who investigated. No one was ever charged — and Democrats suspected that Rove planted the bug himself to distract reporters from the faltering campaign of his client, Bill Clements (who won the election).
Then, in 1989, Rampton launched a series of devastating investigations into every statewide Democratic officeholder in Texas, including Agricultural Commissioner Jim Hightower. Rove (at the time running Republican Rick Perry's campaign for that job) often leaked things to reporters, such as whose names were on subpoenas before they were issued.
So when the Texas state Senate committee found nominee Rove before it in 1991, members thought they had the power to get at the truth.
http://www.latimes.com/news/opinion/la-oe-moore23mar23,0,3813754.story?coll=la-opinion-underdog