What best represents the trend of party polarization over the last three decades?

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Over the last three decades, there has been a clear increase in party polarization, with Republicans and Democrats becoming more ideologically divided and less willing to work together in a bipartisan manner. This has been seen in a variety of ways, from increased political polarization in Congress to greater levels of political polarization among the general public. While there have been some shifts in ideological positions within each party over time, the overall trend has been one of increasing polarization.

What Best Represents the Trend of Party Polarization Over the Last