The live voting of the mid-term elections in the United States began on the 8th, and the most concerned is undoubtedly who can dominate the House of Representatives and the Senate, which is believed to greatly affect the future domestic and diplomatic direction of the Biden Administration. However, the election of the mid-term elections is not just the product of recent developments. In fact, since the end of the 2020 election, the respective competitive strategies of the two parties have been playing a role. On the surface, the 2020 election ended in a Democratic victory. However, what did not attract wide attention at that time was that the Republican Party not only significantly narrowed the gap with the Democratic Party in the House of Representatives, but also continued to control the majority of state governments and state legislatures. The electoral law of the United States is established by the states themselves, so the voting rules of different states are different. In 2020, we will catch up with the once-in-a-decade population census, and we will redistribute the seats of the House of Representatives of the states nationwide according to the population mobility, resulting in more "subsidies" for seats in the states dominated by the Republican Party. At the same time, the Republican Party took the advantage of mastering more state legislatures, redrawed electoral districts to its own advantage, promulgated new election and voting laws, and reduced the voting potential of Democratic voters as much as possible. Relevant measures include imposing more restrictions on postal ballots and on-site voting, so that Democratic voters, represented by ethnic minorities and low-income groups, who are less enthusiastic than their opponents, are more reluctant to vote. Some Republican state parliaments also proposed new legislation to lower the threshold for members to overturn the election results, increase the flexibility of vote checking, and even interfere with the voting results of the electoral college, so as to fundamentally undermine the effectiveness of the voters' voting results. At this stage, in order to cope with the Republican offensive, the Democratic Party is also trying to expand the voting rights of voters, and is also stepping up the promotion of the Voting Rights Protection Act in Congress, but it was eventually blocked by the Republican Party. They did not go down to the grass-roots level as their opponents did, but focused on the goals at the federal level, promoting the legalization of marijuana, calling for racial equality, providing opportunities for illegal immigrants to become regular, and limiting police power. The Biden government is committed to passing a series of large-scale economic stimulus and infrastructure construction plans in terms of legislation, with great momentum but limited results. Compared with the Republican Party's "cultivation in unknown places", the Democratic Party is considered to be more concerned with creating the effect of public opinion and preferring big macro issues. They obviously ignored the option of encroaching on the territory by going step by step from the foundation, disregarded the Republican Party's "making a fortune by whispering" and quietly fought for tangible benefits to win future elections. At the same time, it is clear that the Democrats are not keeping pace with the times. In this mid-term election, the core concern of voters is inflation and price inflation, and violent crimes and illegal immigration are also at the forefront of the agenda. Voters are actually very "pragmatic". At the same time, American society generally tends to be conservative. The practices of extreme liberals please only a few people. They focus on personalized pursuit rather than the overall interests of the Democratic Party. However, Biden did not draw a line with them. As a result, many moderate traditionalists were annoyed. Some "smart" Democrats know this well, so they seek to protect themselves by opposing Biden, while the mainstream of the Democratic Party is still happy with this practice. Obama, Biden and Trump gather in Pennsylvania