Liǎng gè hòuxuǎnrén de zhèngzhì lìchǎng jiérán xiāngfǎn.
The two candidates' political positions are diametrically opposed.
Tips
usage
立场 (lìchǎng, 'standing-place') is the all-purpose word for 'stance / position' on any issue. Pair it with 政治 for politics, 道德 for moral, 中立 for neutral.