In his second attempt at the Senate in 1948, Lyndon Johnson narrowly defeated Coke Stevenson in the Democratic primary when a box with 202 votes, largely in favour of LBJ, was found late in the counting. In the aftermath, Stevenson accused LBJ of having stolen the election and made unsuccessful attempts to overturn the result. There were allegations also surrounding earlier elections - Ross S. Sterling unsuccessfully charged Ma Ferguson with fraud in the 1932 Democratic gubernatorial primary and LBJ's first Senate attempt in 1941 was thwarted when his early lead was overturned due to late returns favouring W. Lee O'Daniel.
What actions were taken by the Democratic Party or by lawmakers to ensure that electoral fraud did not affect subsequent Texas elections?