Here's a completed chart for two selected states, Texas and Illinois, based on the presidential election results from 2000 to 2020:
### State 1: Texas
| Year | # of Electoral College Votes | Winning Candidate | Political Party | Margin of Victory (Dem) | Margin of Victory (Rep) | Difference (Rep - Dem) |
|------|------------------------------|-------------------|------------------|-------------------------|-------------------------|-------------------------|
| 2020 | 38 | Donald Trump | Republican | | 52.1% | 5.6% |
| 2016 | 38 | Donald Trump | Republican | | 52.2% | 9.0% |
| 2012 | 38 | Mitt Romney | Republican | | 57.2% | 16.2% |
| 2008 | 34 | Barack Obama | Democratic | 43.7% | | |
| 2004 | 34 | George W. Bush | Republican | | 61.1% | 20.3% |
| 2000 | 32 | George W. Bush | Republican | | 47.9% | 2.7% |
### State 2: Illinois
| Year | # of Electoral College Votes | Winning Candidate | Political Party | Margin of Victory (Dem) | Margin of Victory (Rep) | Difference (Dem - Rep) |
|------|------------------------------|-------------------|------------------|-------------------------|-------------------------|-------------------------|
| 2020 | 20 | Joe Biden | Democratic | 57.5% | | 17.0% |
| 2016 | 20 | Hillary Clinton | Democratic | 55.4% | | 16.4% |
| 2012 | 20 | Barack Obama | Democratic | 57.4% | | 16.0% |
| 2008 | 21 | Barack Obama | Democratic | 61.8% | | 25.8% |
| 2004 | 21 | John Kerry | Democratic | 54.7% | | 13.9% |
| 2000 | 21 | Al Gore | Democratic | 54.8% | | 10.6% |
### Notes:
- The Electoral College votes listed for Texas in 2000 and prior elections were less than 38. The values for the 2004 election decreased due to the redistribution of electoral votes after the 2010 Census.
- The margins of victory for the Democratic candidate in Illinois are shown while the Republican margins are listed only for the winning candidate in Texas.
- The data for margins of victory indicates the percentage of votes that the winning candidate received over their opponent.
Make sure to verify any specific data you may need from reputable sources, as I have provided a general overview based on historical election data.