Not at all. But Roberts had a solid 30-year history of choosing to support men like Reagan, Bush, and Rehnquist. Roberts worked almost exclusively on conservative causes. The couple of instances where Roberts helped out on other cases that were not conservative was in cases where Roberts was doing a favor for a collegue. Coulter shot from the hip against Roberts and missed the target completely.
The "just trust me" comment was made in reference to Harriet Miers. NOT Roberts.