Oh come on. Have you forgotten recent history?? Thanks!!
If you're talking about 2016, the problem wasn't with the polls. The reputable polls in each of the states were all within the margin of error. The problem is with the analysis of the polls. Too many pundits did not take the electoral college into account when proclaiming the likelihood of victory for Trump. And if we look at the national polls they actually did reflect the popular vote.
So, this idea some people have that all polls are broken because Trump barely won by tens of thousands of votes in a handful of swing states is just sheer stupidity and is based on ignorance of how polls work and what actually happened in 2016.
The polls were in the margin of error.
Let's look at Trump's margins in those swing states:
The 10 Closest States in the 2016 Election
1. Michigan 0.3 percent
Trump 47.6 percent, Clinton 47.3 percent
Difference: 13,080 votes
2. New Hampshire 0.4 percent
Clinton 47.6 percent, Trump 47.2 percent
Difference: 2,701 votes
3. Wisconsin 1 percent
Trump 47.9 percent, Clinton 46.9 percent
Difference: 27,257 votes
4. Pennsylvania 1.2 percent
Trump 48.8 percent, Clinton 47.6 percent
Difference: 68,236 votes (99 percent reporting)
5. Florida 1.2 percent
Trump 49 percent, Clinton 47.8 percent
Difference: 114,455 votes
6. Minnesota 1.5 percent
Clinton 46.4 percent, Trump 44.9 percent
Difference: 44,470 votes
7. Nevada 2.4 percent
Clinton 47.9 percent, Trump 45.5 percent
Difference: 26,434 votes
8. Maine 2.7 percent
Clinton 47.9 percent, Trump 45.2 percent
Difference: 19,995 votes
9. North Carolina 3.8 percent
Trump 49.9 percent, Clinton 46.1 percent
Difference: 177,009 votes
10. Arizona 3.9 percent
Trump 49.3 percent, Clinton 45.4 percent
Difference: 91,682 votes
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It was a close election. The polls weren't broken. Trump only barely won.