Atlanta--Former U.S. Senator Bob Dole joined the strategic advisory board of VetExchange, a Web marketplace for transactions between veterinarians, suppliers and manufacturers. Out-of-office politicians, including former Senator Bill Bradley, have traditionally flocked to investment banks for lucrative consulting assignments. But many are now turning to Internet ventures. Former White House chief of staff Erskine Bowles, for example, recently joined the board of b-to-b company Intelysis Electronic Commerce, New York.