No 12th Amendment

In OTL the Twelfth Amendment replaced the old Electoral system of the United States of America where in the candidate to get the most votes for President became President and the candidate to come in second became Vice President. This was changed as a result of Political Parties rising; as parties didn't formally exist till that time. The elections began to result in the two executives of state being from rival parties (see Election of 1796) and the Twelfth Amendment was made to prevent this; but what if it didn't pass? What if this was seen as a 'safe guard' on power (George Washington wasn't a fan of party politics)? San Marino for example made it so that the two heads of state had to be from rival political parties after the Fascist government was overthrown. They did this as a safeguard; so what if that argument had emerged and won out and all elections from 1803 onward continued to use the original electoral system? This would cost the US government efficiency but would also require compromise between rival parties; encouraging bi-partisan solutions as seen in San Marino today. The entire game of the presidential race is different by maintaining the old system; while candidates are associated with political parties there is no limit to how many may run- no party primaries. Meaning that parties will have more then one candidate running (usually 2). It's a very very different United States; back in the day parties 'nominated' candidates to the public and the people voted- it's like watching a Youtube video by a political commentator to find out who they support except it came as a news letter in the mail. For example in 1792 election both the Federalist and Democratic-Republican party nominated George Washington but also John Adams (Fed) and George Clinton (DR). It's a more rational rather then loyalty driven electoral system.

How Elections Work
Electoral College

Congressional Nomination Caucus (an informal meeting of congressmen regarding who to nominate for the Presidency, two candidates are nominated by each political party as parties have rose with the aim of getting both candidates the most and second most votes. These meetings lean towards 2 as there are two positions to be filled and after the 1796 election parties sought to avoid the previous situation which in OTL prompted the 12th amendment. Though candidates can 'enter the race' late and tend to if one of the two begins to fall behind- while votes can't be changed these late entries aim to improve the odds of the party having both the Presidency and Vice Presidency with the party requesting the 'lagging' candidate to step out of the race though this doesn't nullify the votes they have received. This takes the place of 'Party Primaries' in OTL.)

Presidents and Vice Presidents of the United States of America

 * 1796: John Adams (2nd Term PRE) (Fed) and Thomas Jefferson (VP) (DeRe)
 * 1800:

What to Expect

 * Straight Party ballots not becoming a thing as it'd be one person voting for multiple presidential candidates in the election.
 * Lots of compromise and a lack of much 'radical' change.