Holiday Party Bean Salsa

"Such pretty colors freckling the buffet or picnic table, with this salsa in the starring role! An easy-to-put-together QUICK little number that will tingle the taste buds with its perky piquant flavor combination. My mother didn't know my four brothers and I were throwing her a surprise party to celebrate her 75th birthday on December 25th (2009), but she had a slew of stuff already prepared for what she thought was a smaller Christmas party. My sis-in-law (Kim) shared this recipe with Ma, and she passed it along to me, so this is truly a family favorite--and my Dear Hubby (who usually doesn't like bean salads with vinegary-oil dressings) loved this concoction...AND my Dear Son-the-onion-hater actually thought this was pretty decent, too (even if he "had" to pick out the onjens/onions!). PREP time includes cooling time for the dressing and a 24 hour marinating period for the beans. PLAN AHEAD!!! Ma tells me that this "lasts forever" with the vinegar in there, and she added salt; I also thought it might be good to add some cilantro or a pinch of red pepper flakes...."