Presidents are not appointed- they are elected. A senator or representative can run for president , but if elected president , he must resign any previous office before he takes office as president.
No."Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an Elector."Source: http://www.archives.gov/federal-register/electoral-college/provisions.html#provisions
three times as long as that of a Representative
yes Andrew Johnson became a senator in 1975 and John Quincy Adams was a representative from 1843-1848
a
Gerald Ford was elected to office as a U.S. Representative in 1949 at the age of 36. He was not elected to the office of Vice President. He was appointed after Spiro Agnew resigned. He was also not elected to the office of President, and became President after Richard Nixon resigned.
President Obama appointed Jacob Lew to his current office of Secretary of the Treasury.
A senator is never "appointed" president. He may be elected President of the U.S., in which case he must leave the Senate before taking office as President. In this case his successor is selected in accordance with the law of the state from which he came. Some states require a special election to fill the seat very quickly; others permit the Governor to appoint a successor who serves until the next general election (usually 2 years or less away) in which a successor will be elected to serve the reminder of the former senator's term. A senator may also be elected President pro tempore of the Senate. In this case he remains a senator but presides over the Senate in the absence of the Vice President who is also the President of the Senate.
The President.
Office of the U.S. Trade Representative
senator
Gerald Ford was appointed vice-president when Agnew resigned his office.
No Senator or Representative, or person holding an office Trust or Profit under the United States, shall be appointed an elector. See Article II, Section 1 Clause 3 of the US Constitution.