1920: Women earn the right to vote. Women were only allowed to vote in a few states in the early twentieth century. With the adoption of the 19th amendment to the United States Constitution in 1920, women around the country gained the right to vote after decades of organizing and advocacy. Women voting would mean more evaluating of candidates. It meant that the candidates would now be assessed by more people. The outcome would definitely be different as now politicians needed to convince women of their worthiness, as opposed to before where only men, in most cases, would be a vote.
1982: Additional voting rights for people with disabilities are mandated by Congress. The Voting Rights Act was renewed for another 25 years by Congress. Congress wanted states to take measures to make voting more available to the elderly and people with disabilities as part of the extension. This meant that people with disabilities get involved, making people trust the system and in turn affecting outcomes positively.
1993. Motor Voter becomes a law. The National Voter Registration Act was passed in response to historically low voter registration rates. The statute, also known as "motor voter," allowed states to encourage residents to register to vote while applying for driver's licenses. States were also forced to provide mail-in registration and to enable citizens to register to vote at public assistance offices under the legislation. Because of this, more than 30 million people completed voter registration applications or revised their registration by means made available by the law in the first year of its enforcement, which changes outcome as more registered voters means more voters voting. 
2013: The Supreme Court struck down the Voting Rights Act, section 4(b). The Supreme Court of the United States gutted the Voting Rights Act in Shelby County v. Holder in June. States and localities with a history of restricting voting rights were no longer forced to apply changes to their election laws to the US Justice Department for approval after the Court's decision. This meant that the Fifteenth Amendment commands that the right to vote shall not be denied or abridged on the basis of race or color, and it grants Congress the power to implement that command, which would translate to more legit election outcomes.