Final answer:
Recent presidential elections show a pattern of campaigns targeting independent voters and battleground states, and an increase in party-line voting among electorates.
Step-by-step explanation:
Two clear patterns that have been evident in recent presidential elections are the focus on targeting independent voters and specific battleground states, and the importance of party-line voting tendencies. In the 2016 election, candidates made strategic moves to win over states that previously hadn't been considered battlegrounds, with Donald Trump successfully flipping Michigan and Wisconsin by narrow margins.
Another pattern is the solidification of party loyalty among voters, exemplified by the division into Democratic "blue" states and Republican "red" states, and the trend where voters consistently support the same party for both the presidency and Congress, as has been increasingly observed in congressional elections.