That's right. Also worth noting that if you want to influence policy (as opposed to getting personal favors) it is quite effective to call their office and speak to staffer, or write a letter. Every call and letter is assumed to represent the views of hundreds of people who couldn't be bothered to call or write. You don't have to be long-winded because the only result of your action will be that a staffer puts a tally mark on a sheet of paper, but the results of those tallies can occasionally move the needle on votes.