Lets Get Real:
The US Senate gives advice and consent to Presidential nominations from the Government to the Courts, Nixon had two Supeme Court Justices rejected by the Senate, Reagan had Bork rejected, Bush 41 had Senator Tower rejected as Defence Secretary, Bill Clinton had a nightmare getting a Attorney General, while Bush 43 had could not get his choice as UN Ambassador pass the Senate. Thus the Rice fight matters folks, if the Republicans keep together they can block the choice, thus lets see if POTUS wants to spend his political capital on a fight that he could lose and does not need to have, Senator Kerry would be an excellent choice for State.