http://www.senate.gov/artandhistory/history/common/briefing/Direct_Election_Senators.htmThis process seemed to work well until the mid-1850s. At that time, growing hostilities in various states resulted in vacant Senate seats. In Indiana, for example, the conflict between Democrats in the southern half of the state and the emerging Republican party in the northern half prevented the election of any candidate, thereby leaving the Senate seat vacant for two years. This marked the beginning of many contentious battles in state legislatures, as the struggle to elect senators reflected the increasing tensions over slavery and states' rights which led to the Civil War.
After the Civil War, problems in senatorial elections by the state legislatures multiplied. . . . Intimidation and bribery marked some of the states' selection of senators. Nine bribery cases were brought before the Senate between 1866 and 1906. In addition, forty-five deadlocks occurred in twenty states between 1891 and 1905, resulting in numerous delays in seating senators. In 1899, problems in electing a senator in Delaware were so acute that the state legislature did not send a senator to Washington for four years. . . .
After the turn of the century, momentum for reform grew rapidly. William Randolph Hearst expanded his publishing empire with Cosmopolitan, and championed the cause of direct election with muckraking articles and strong advocacy of reform. Hearst hired a veteran reporter, David Graham Phillips,
who wrote scathing pieces on senators, portraying them as pawns of industrialists and financiers. The pieces became a series titled "The Treason of the Senate," which appeared in several monthly issues of the magazine in 1906. These articles galvanized the public into maintaining pressure on the Senate for reform.
http://www.ourdocuments.gov/doc.php?flash=old&doc=58Late in the 19th century, some state legislatures deadlocked over the election of a senator when different parties controlled different houses, and Senate vacancies could last months or years. In other cases, special interests or political machines gained control over the state legislature.
Progressive reformers dismissed individuals elected by such legislatures as puppets and the Senate as a "millionaire’s club" serving powerful private interests.One Progressive response to these concerns was the "Oregon system," which utilized a state primary election to identify the voters’ choice for Senator while pledging all candidates for the state legislature to honor the primary’s result. Over half of the states adopted the "Oregon system," but the 1912 Senate investigation of bribery and corruption in the election of Illinois Senator William Lorimer indicated that only a constitutional amendment mandating the direct election of Senators by a state’s citizenry would allay public demands for reform.
When the House passed proposed amendments for the direct election of Senators in 1910 and 1911, they included a "race rider" meant to bar Federal intervention in cases of racial discrimination among voters. This would be done by vesting complete control of Senate elections in state governments. A substitute amendment by Senator Joseph L. Bristow of Kansas provided for the direct election of Senators without the "race rider." It was adopted by the Senate on a close vote before the proposed constitutional amendment itself passed the Senate. Over a year later, the House accepted the change, and on April 8, 1913, the resolution became the 17th amendment.