While the President was limited to two terms, do we need a Constitutional Amendment to limit Senators and Representatives to two terms also?

The Presidential position has a two term limit. Would it be helpful if members of Congress also had a two term limit? We see a large number of politicians making politics their careers. I wonder who they are serving when it is necessary for them to raise money repeatedly, election after election. Our members of Congress who have been reelected repeatedly into the same or higher positions mover further away from serving the interests of the people and closer to the interest of serving big money. I wonder if current gridlocks could be explained by the interests of large contributors and if the arguments we're seeing one party against the other can be compared to the analogy of big business competition say for example Verizon v. Sprint. Is this too simple of an analogy?

http://wichitaliberty.org/politics/arguments-term-limits/