In the past, most voters had already made up their minds whom they were going to vote for before campaigning even began. But a 1980 study showed that only 16 percent of voters do so now; the rest of the votes are up for grabs.
過去，「鐵票」在選舉中舉足輕重。但是民國六十九年，政治大學政治系教授陳義彥，在台北地區所做的調查顯示，競選活動開始前便已經決定將票投給誰的選民，只佔總數的百分之十六左右。