When Tina Fey did Sarah Palin everyone said the impersonation was dead on....
This one, the guy uses his own regular voice....
IIRC, initially he would make some effort to mimic. The skits during the primaries he tried to at least get the odd speech pattern.
Then last week the guy just phoned it in and this week as well. I guess it was ok to mock him as the candidate but now as Prez they are too leery to do so.