MyDD.com is not impressed with Hillary's ability to help down ballot candidates: 

In an incredible wave year, in one of the blueish states in the country, we picked up just three House seats and one state Senate seat.  There were three, maybe even four, more seats we could have taken.  And we didn't come close to taking the state Senate, which we need to do to be in a position for redistricting in 2010.  I'm no Evan Bayh fan, but at least in Indiana we got three seats out of three seats we could have gotten.

So be aware.  At the top of the ticket, Hillary Clinton spent more money on her reelection campaign than any Senate campaign in the country, and had no opponent.  And at the end of the day, despite all the money raised and all the campaigns she did events for, her name on the ticket in New York state helped no one but herself.

Hillary Clinton may win the nomination, and she may be able to win the White House.  Or she may decide not to run for President, and become a wonky technocratic Senator.  But regardless of what happens, don't expect her to bring anyone into office with her.  That's not how the Clinton's work.